Prior Lake Water Hardness & Quality Report (2026)
Water Hardness
19.3 grains per gallon
Source
groundwater
pH Level
8
neutral = 7.0
Lead
0.004 mg/L
✓ Below action level
TDS
332 mg/L
Est. Daily Cost
$0.88
energy & soap waste
Source: See methodology section below · Updated 2026
0–60
mg/L
Soft
61–120
mg/L
Moderately Hard
121–180
mg/L
Hard
180+
mg/L
Very Hard
Appliance Damage Report
In Prior Lake, your appliances are currently losing 44% efficiency due to mineral buildup.
| Appliance | In Prior Lake | Soft Water City | Efficiency Loss |
|---|---|---|---|
| Kettle | 1.5 yrs | 8.5 yrs | -82% |
| Washing Machine | 3 yrs | 12 yrs | -75% |
| Water Heater | 5 yrs | 15 yrs | -67% |
Regional Water Comparison
How Prior Lake compares to its nearest neighbours
| City | Hardness | PFAS (ppt) | Risk | Source |
|---|---|---|---|---|
| ▶ Prior Lake, Minnesota | 330.2 mg/L | 0 ppt | 🔴 Very Hard | groundwater |
| Savage, Minnesota | ≈ 180+ mg/L | 0 ppt | 🔴 Very Hard | river |
| Shakopee, Minnesota | ≈ 180+ mg/L | 562.2 ppt | 🔴 Very Hard | groundwater |
| Eden Prairie, Minnesota | ≈ 120–179 mg/L | 23.4 ppt | 🟠 Hard | groundwater |
| Burnsville, Minnesota | 393 mg/L | 97 ppt | 🔴 Very Hard | river |
National Benchmark
How Prior Lake compares to the USA average
| Benchmark | Hardness | Appliance Risk |
|---|---|---|
| ▶ Prior Lake | 330.2 mg/L | 🔴 High |
| USA National Avg | 151 mg/L | 🟠 Moderate |
| Scarsdale Top Rated | 0.02 mg/L | 🟢 None |
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What Makes Prior Lake's Water Unique?
Local geology and source profile
The City of Prior Lake Public Works Department operates the water treatment facility serving Prior Lake, Minnesota, in Scott County. Water is sourced from seven groundwater wells ranging from 345 to 640 feet deep, tapping the Jordan and Tunnel City-Wonewoc aquifers. The facility treats water primarily to remove iron and manganese but does not soften it, leaving hardness for residents to address with home systems. The utility supplies residential, commercial, and business customers throughout the city.
The supply originates from deep aquifers shaped by the Prairie du Chien-Jordan and Jordan formations beneath Scott County. These consist of Ordovician limestone and dolomite alongside Cambrian sandstone layers that contribute dissolved calcium and magnesium minerals, creating a very hard supply. The geological makeup of these bedrock aquifers, formed under ancient shallow seas, imparts a highly mineralized character with no surface water influence.
Very hard water in Prior Lake scales water heaters, plumbing fixtures, and appliances rapidly, reducing efficiency and lifespan. Dishwashers, washing machines, and faucets show buildup fastest, leading to higher energy bills and frequent maintenance. Home water softeners are strongly recommended, set to 19–21 grains per gallon; regular salt refills and resin cleaning extend system life, while pre-treatment for iron aids efficiency. Treatment adds chlorine (0.78 ppm) and fluoride (0.6 ppm); water meets federal standards, though advocacy analyses flag radium, trihalomethanes, arsenic, manganese, nitrite, and bromide above health guidelines.
Geology & Source: Jordan and Prairie du Chien-Jordan aquifers; Tunnel City-Wonewoc sands — Ordovician limestone, dolomite, and Cambrian sandstone; karstic carbonate dissolution of calcium and magnesium yields very hard groundwater
Other Minnesota Water Reports
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Frequently Asked Questions
Is Prior Lake's water safe to drink?
Do I need a water softener in Prior Lake?
How does Prior Lake compare to the USA average?
Data Sources & Methodology
Water quality data for Prior Lake is derived from geographic and geological modelling of the surrounding region. No federal monitoring station data was available for this location.
Water Hardness
Modelled estimate based on state-level USGS geological survey data for this region. No direct USGS Water Quality Portal measurement was matched to this city — the value reflects a statistical range calibrated to the state's dominant rock types and typical source water characteristics.
pH
Estimated from regional geology and source water characteristics. pH is correlated with water hardness and local bedrock — values may differ from utility-reported figures.
TDS — Total Dissolved Solids
Estimated using a derived ratio from water hardness and regional conductance profiles. TDS in natural water correlates strongly with total mineral content including hardness ions.
PFAS — Perfluoroalkyl and Polyfluoroalkyl Substances
EPA UCMR5 (5th Unregulated Contaminant Monitoring Rule, 2023–2025) — sum of PFAS compounds detected at the public water system serving this city. A value of 0 indicates the system was sampled with no detection above reporting limits.
Lead
Modelled estimate based on the EPA Lead and Copper Rule 90th-percentile tap-sample methodology. No publicly available per-city lead dataset with sufficient national coverage exists. Values are a conservative baseline derived from city population tier and infrastructure age — all estimates are maintained below the EPA action level of 0.015 mg/L.
Appliance Lifespan
Calculated from water hardness using a linear degradation model. Baseline lifespans represent soft-water performance (kettle: 8.5 yrs, washing machine: 12.0 yrs, water heater: 15.0 yrs). Hard water mineral scale progressively reduces operational life in direct proportion to hardness concentration.